WAEC Geography 2017 Papers

Concept:The Earth rotates through $15^\circ$ of longitude in 1 hour. Therefore, the time difference between two places depends on their difference in longitude.Explanation:Town X lies on the Greenwich Meridian, which has a longitude of $0^\circ$.Town Y lies on longitude $45^\circ\text{ E}$.Since both towns are measured from the Greenwich Meridian, the longitude difference is $45^\circ$ eastward.Time difference $= \frac{\text{longitude difference}}{15^\circ} = \frac{45^\circ}{15^\circ} = 3$ hours.Town Y is east of Town X.Places to the east see the Sun earlier, so their local time is ahead.Hence, add the time difference to the time at X: $4:00\text{ pm} + 3\text{ hours} = 7:00\text{ pm}$.So the time at Town Y is exactly 7:00 pm.Answer:D. 7.00pm